CVE-2026-5550Network attack vector

Authenticated code execution via unchecked NVRAM copy

Published Apr 5, 2026 · Updated Apr 5, 2026

Stack-based buffer overflow in Tenda AC10 16.03.10.10_multi_TDE01 allows remote authenticated users to corrupt httpd memory. The GetValue routine reads attacker-influenced NVRAM data into a 36-byte stack buffer in fromSysToolChangePwd without a length argument or bounds check. A logged-in network user able to store an oversized configuration value can crash the router or execute code; missing canaries, PIE, and ASLR make exploitation reliable.

CVSS severity8.8
High
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Tenda AC10 16.03.10.10_multi_TDE01 allows remote authenticated users to corrupt httpd memory. The GetValue routine reads attacker-influenced NVRAM data into a 36-byte stack buffer in fromSysToolChangePwd without a length argument or bounds check. A logged-in network user able to store an oversized configuration value can crash the router or execute code; missing canaries, PIE, and ASLR make exploitation reliable.

The record

CVE
CVE-2026-5550
Published
Apr 5, 2026
Updated
Apr 5, 2026
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AC10
Classifications
CWE-121, CWE-119, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=16.03.10.10_multi_TDE01

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · AC10version=16.03.10.10_multi_TDE01

Published CVSS scores

8.7VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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